Hi, a few things to check.
Make sure to connect the 7500a power plug directly to a wall receptacle.
Is the 7500a firmware up to date?
How long is the USB cable(s)?
Take a look at this HP link.
Hi, a few things to check.
Make sure to connect the 7500a power plug directly to a wall receptacle.
Is the 7500a firmware up to date?
How long is the USB cable(s)?
Take a look at this HP link.